Hi,So far the plugin only tries to connect to the external ip as opposed to the local (your internal ip), this means that your router and firewall must be set up to allow incoming connections. Normally this mean that the router must have uPNP enabled and your plex media server must be configured to tell the router to open and forward the correct port mapping.You can have a look in the plex media server configuration web interface under "Remote access", for the Movian plugin to work a this stage, a green text saying "Fully accessible outside your network" must be visible on this page.

The plugin currently have the shortcoming that it only tries to connect to the external ip of a plex media server. I plan to fix this during the coming days.

It works here (Plex server on my Synology DS415play, and I also created an account on Plex Web. UPNP is deactivated on my router but I had 32400 forwarded in. Everything works fine. Sorry it doesn't work for you